Centrotec Sustainable AG

LED Lenser: Part of the Portfolio since 2014... (Some say the only valuable thing Guido ever gave to shareholders) Most exhibits here are about money that vanished. Centrotec is about money that arrived – to someone else, just after you were shown the door. It is the museum’s monument to the German minority shareholder, that most patient and most disposable of creatures.

Centrotec Sustainable AG was a tidy Mittelstand champion in building climate technology, its crown jewel Wolf, a maker of heating systems, boilers and – crucially – heat pumps. A boring, cyclical, perfectly decent business, majority-controlled by its founder Guido Krass, who held around 67%.

In November 2020, with the stock unloved and the price depressed, Krass moved to take the company private – a delisting from the Frankfurt exchange. Free-float holders were offered, critics noted, essentially the legally required minimum, around €15 a share.

Commentators (Euro am Sonntag among them) cried foul: the minority was, in the precise German phrase, geschädigt – disadvantaged – and an independent board, they argued, would never have waved through certain related transactions, including Krass’s purchase of his own Pari holding company for €43m.

And it was all entirely legal. That is both the genius and the horror of it. No fraud, no missing billions, no perp walk – just a controlling owner using the rulebook exactly as written to retire the public at the cheapest defensible moment, as the shares slipped off the official market in early 2021.

And then – the punchline that makes this an exhibit rather than a footnote – history happened. In 2022 Russia invaded Ukraine, European gas prices went vertical, and Germany passed a heating law that turned the humble heat pump into the most strategically prized appliance on the continent.

Firms that made them became, overnight, darlings of the green transition. Wolf was suddenly sitting on gold. The minority shareholders, cashed out at ~€15 a year earlier, watched the gold rush from the pavement, no longer invited to the party they had funded for years. There is no chart of their loss, because the loss is invisible: it is the upside that someone else, quite legally, kept.

Shares in the Hamburg Market were traded as high as 70 Euro in late 2025.